1. Nonlinear Oscillations;Nayfeh,1979
2. Non-Linear Vibrations;Schmidt,1986
3. Introduction to Linear, Parametric and Nonlinear Vibrations;Cartmell,1990
4. A. Tondl, A Contribution to the Analysis of an Autoparametric System (will be published in Festschrift zum. 80. Geburtstag von Prof. K. Magnus).
5. Model simulation of parametrically excited ship rolling;Tondl;Nonlinear Dynamics,1990